NIT No-17 EE (SDW) II/ (21-22) Item No. 4

Renovation /strengthening of FST (Final Settling Tank ) No. 1 at 37 MGD STP Okhla by carrying out the following works:- Isolating the Final Settling Tank (FST) from inflowing and out flowing channel by closing sluice gate and providing gunny bags to ensure no flow in the FST. Dewatering the stagnant water from the FST with the help of submersible pump and D.G. set. Cleaning the site manually for execution the work.

Dismantling of motor, gear box and other mechanical fixtures from the top of centre mechanism and shifting to workable safe place.

Making temporary platform in the FST around the central post as per site requirement.

Dismantling the all worn out angle iron, scrappers, and damaged portion of the drum by cutting nut & bolt with the help of Gas cutter, man power, and labour as per site requirement / strategy.

Dismantling of internal gears of turn table, and lifting and shifting to ground level.

Repairing of centre drum by patch work using 8mm thick M.S. sheets (approx 15 sqm) and homogenous electric and welding i/c replacement of the damaged stiffeners of the drum with the help of electric welding by providing of size 50x8mm M.S. flat as per site requirement. The job also includes replacement of the damaged portion of the drum and restringing with 50x50mm angle iron fixed on the top and bottom of the drum with the help of electric welding.

Providing/fixing of SS Tie Rod of size 5/8” dia x length 5 Mtrs. Apprx. both side of central drum for holding the scrapper arms with adjustment assembly.

Renovation and strengthening of scrapper arms structure by way of providing / fixing new elements of the structure made out of M.S. angle iron of size 75x75x8 , 65x65x8 mm & 50x50x8 mm by using new fasteners and homogenous electric arc welding and balancing the both side arm with the help of tie rod and with adjustment bolts.

Fab. /providing of sets of bottom scrappers of sizes appx 2700 x 200 x 8 mm along with rubber squeezers & M.S. flat.

Providing/fixing 300mm (or suitable size) Non-Rising Sluice Valve confirming IS:14846 PN 1.6, Body, Dome, Wedge – CI IS: 210, Gr. FG260, SS spindle, Spindle Nut of Bronze IS:318, Flanges drilled as per IS:1538 complete with Gland Packing, fasteners etc. Make: Kirloskar/IVC/VAG and any other DJB approved make.

Dismantling the v-notch of the PST and re-fixing the same by replacement of damaged nut bolts (approx. 150 nos.) with the help of gas cutter, drilling holes etc. in the RCC wall of PST and making proper leveling and alignments.

Repairing of turn table, including wheels, Oil pump, oil pipe and other allied works as per site requirement.

Overhauling the gear box of FST complete all respect. The job also i/c rewinding the motor, top-up of lubricant and replacement of coupler/base frame.

Providing/Fixing a set of Bearing comprising Bearings Nos. 7206 = 2 Nos. and 30212 = 2 Nos. Make:- SKF/FAG

Replacement of MS chequered sheet, 8mm thick, 0.950 mtr. wide in a length of 24 Mtr. Approx. by cutting of old rusted/ corroded sheet & fixing of new sheet with welding work

Painting the complete structure by carrying out following works:- Providing the metal primer red oxide (in 20 Ltrs. Packing)

Providing the synthetic enamel paint Black (in 20 Ltrs. Packing) Make:- Asian/Nerolec/Berger

Providing the synthetic enamel paint tractor orange (in 20 Ltrs. Packing) Make:- Asian/Nerolec/Berger

Providing of thinner (General propose) for diluting the paint (in 20 Ltrs. Packing)

Painting the complete structure with one coat of epoxy primer and two or more coat of enameled paint as per requirements.

Assembling, testing & commissioning of complete unit on NO load / full load after removing gunny bags and temporary platform.

MITTAL TRADING COMPANY